infinite series!

• March 19th 2012, 07:02 AM
lawochekel
infinite series!
18,2,2/9...............
pls guys the equation above represent a series, have tried to obtain the nth term but no avail, can any help me here.

appreciate!
• March 19th 2012, 07:19 AM
princeps
Re: infinite series!
Quote:

Originally Posted by lawochekel
18,2,2/9...............
pls guys the equation above represent a series, have tried to obtain the nth term but no avail, can any help me here.

appreciate!

$a_n=2 \cdot 9^{(2-n)}$